Water filter



FIG. 1 is a perspective view of a water filter showing my new design;

FIG. 2 is a side elevation view thereof, the opposite side being a mirror image of the side shown; and

FIG. 3 is a top plan view thereof on a reduced scale, it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a water filter, as shown and described. 